package com.itheima.controller;

import com.itheima.domain.R;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;
/*
*    图片上传下载功能
* */
@RestController
@RequestMapping("/common")
public class UploadController {

    @Value("${reggie.path}")
    private String path;

   /* @PostMapping("/upload")
    public R upload(MultipartFile file) throws IOException {
        //获取上传路径名
        String filename = file.getOriginalFilename();
        filename = filename.substring(filename.lastIndexOf("."));
        String name = UUID.randomUUID().toString().replace("-", "");
        filename = name + filename;
        System.out.println("文件名:"+ filename);
        //创建一个文件夹
        File file1 = new File(path);
        if(!file1.exists()){
            file1.mkdirs();//创建文件夹
        }
        file.transferTo(new File(path+filename));

        return R.success(path+filename);
    }*/

   @PostMapping("/upload")
   public R<String> upload(MultipartFile file){
       //file是一个临时文件，需要转存到指定位置，否则本次请求完成后临时文件会删除

       //原始文件名
       String originalFilename = file.getOriginalFilename();//abc.jpg
       String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));

       //使用UUID重新生成文件名，防止文件名称重复造成文件覆盖
       String fileName = UUID.randomUUID().toString() + suffix;//dfsdfdfd.jpg
       //创建一个目录对象
       File dir = new File(path);
       //判断当前目录是否存在
       if(!dir.exists()){
           //目录不存在，需要创建
           dir.mkdirs();
       }
       try {
           //将临时文件转存到指定位置
           file.transferTo(new File(path + fileName));
       } catch (IOException e) {
           e.printStackTrace();
       }
       return R.success(fileName);
   }
    @GetMapping("/download")
    public void download(String name,HttpServletResponse response) throws IOException {
        //输入流，通过输入流读取文件内容
            FileInputStream fileInputStream = new FileInputStream(new File(path + name));
            ServletOutputStream outputStream = response.getOutputStream();
            response.setContentType("image/jpeg");

            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len=fileInputStream.read(bytes))!=-1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }
        fileInputStream.close();
        outputStream.close();
    }
}
